Mention the EEXIST fix.
[rsync.git] / rsync.c
diff --git a/rsync.c b/rsync.c
index ceabfdacc352a09c0fbe40d55b28f914c97bd82c..ca21e5e44bea1b4708c51fcf82e466b4a2bbc7f4 100644 (file)
--- a/rsync.c
+++ b/rsync.c
@@ -1,17 +1,17 @@
-/* 
+/*
    Copyright (C) Andrew Tridgell 1996
    Copyright (C) Paul Mackerras 1996
-   
+
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.
-   
+
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
-   
+
    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 
 extern int verbose;
 extern int dry_run;
+extern int daemon_log_format_has_i;
 extern int preserve_times;
+extern int omit_dir_times;
 extern int am_root;
+extern int am_server;
+extern int am_sender;
+extern int am_generator;
+extern int am_starting_up;
 extern int preserve_uid;
 extern int preserve_gid;
-extern int preserve_perms;
+extern int inplace;
+extern int keep_dirlinks;
 extern int make_backups;
-extern char *backup_suffix;
+extern struct stats stats;
 
 
 /*
@@ -43,180 +50,100 @@ void free_sums(struct sum_struct *s)
 }
 
 
-/*
- * delete a file or directory. If force_delet is set then delete 
- * recursively 
- */
-int delete_file(char *fname)
-{
-       DIR *d;
-       struct dirent *di;
-       char buf[MAXPATHLEN];
-       extern int force_delete;
-       STRUCT_STAT st;
-       int ret;
-       extern int recurse;
-
-       if (do_unlink(fname) == 0 || errno == ENOENT) return 0;
-
-#if SUPPORT_LINKS
-       ret = do_lstat(fname, &st);
-#else
-       ret = do_stat(fname, &st);
-#endif
-       if (ret) {
-               rprintf(FERROR,"stat(%s) : %s\n", fname, strerror(errno));
-               return -1;
-       }
-
-       if (!S_ISDIR(st.st_mode)) {
-               rprintf(FERROR,"unlink(%s) : %s\n", fname, strerror(errno));
-               return -1;
-       }
-
-       if (do_rmdir(fname) == 0 || errno == ENOENT) return 0;
-       if (!force_delete || !recurse || 
-           (errno != ENOTEMPTY && errno != EEXIST)) {
-               rprintf(FERROR,"rmdir(%s) : %s\n", fname, strerror(errno));
-               return -1;
-       }
-
-       /* now we do a recsursive delete on the directory ... */
-       d = opendir(fname);
-       if (!d) {
-               rprintf(FERROR,"opendir(%s): %s\n",
-                       fname,strerror(errno));
-               return -1;
-       }
-
-       for (di=readdir(d); di; di=readdir(d)) {
-               char *dname = d_name(di);
-               if (strcmp(dname,".")==0 ||
-                   strcmp(dname,"..")==0)
-                       continue;
-               slprintf(buf, sizeof(buf), "%s/%s", fname, dname);
-               if (verbose > 0)
-                       rprintf(FINFO,"deleting %s\n", buf);
-               if (delete_file(buf) != 0) {
-                       closedir(d);
-                       return -1;
-               }
-       }       
-
-       closedir(d);
-       
-       if (do_rmdir(fname) != 0) {
-               rprintf(FERROR,"rmdir(%s) : %s\n", fname, strerror(errno));
-               return -1;
-       }
-
-       return 0;
-}
-
-static int is_in_group(gid_t gid)
-{
-#ifdef HAVE_GETGROUPS
-       static gid_t last_in = (gid_t) -2, last_out;
-       static int ngroups = -2;
-       static gid_t *gidset;
-       int n;
-
-       if (gid == last_in)
-               return last_out;
-       if (ngroups < -1) {
-               /* treat failure (-1) as if not member of any group */
-               ngroups = getgroups(0, 0);
-               if (ngroups > 0) {
-                       gidset = (gid_t *) malloc(ngroups * sizeof(gid_t));
-                       ngroups = getgroups(ngroups, gidset);
-               }
-       }
-
-       last_in = gid;
-       last_out = 0;
-       for (n = 0; n < ngroups; n++) {
-               if (gidset[n] == gid) {
-                       last_out = 1;
-                       break;
-               }
-       }
-       return last_out;
-
-#else
-       return 0;
-#endif
-}
-
 int set_perms(char *fname,struct file_struct *file,STRUCT_STAT *st,
-             int report)
+             int flags)
 {
        int updated = 0;
        STRUCT_STAT st2;
        int change_uid, change_gid;
-       extern int am_daemon;
-
-       if (dry_run) return 0;
 
        if (!st) {
-               if (link_stat(fname,&st2) != 0) {
-                       rprintf(FERROR,"stat %s : %s\n",fname,strerror(errno));
+               if (dry_run)
+                       return 1;
+               if (link_stat(fname, &st2, 0) < 0) {
+                       rsyserr(FERROR, errno, "stat %s failed",
+                               full_fname(fname));
                        return 0;
                }
                st = &st2;
        }
 
-       if (preserve_times && !S_ISLNK(st->st_mode) &&
-           st->st_mtime != file->modtime) {
-               /* don't complain about not setting times on directories
-                  because some filesystems can't do it */
-               if (set_modtime(fname,file->modtime) != 0 &&
-                   !S_ISDIR(st->st_mode)) {
-                       rprintf(FERROR,"failed to set times on %s : %s\n",
-                               fname,strerror(errno));
+       if (!preserve_times || S_ISLNK(st->st_mode)
+        || (S_ISDIR(st->st_mode) && omit_dir_times))
+               flags |= PERMS_SKIP_MTIME;
+       if (!(flags & PERMS_SKIP_MTIME)
+           && cmp_modtime(st->st_mtime, file->modtime) != 0) {
+               if (set_modtime(fname,file->modtime) != 0) {
+                       rsyserr(FERROR, errno, "failed to set times on %s",
+                               full_fname(fname));
                        return 0;
-               } else {
-                       updated = 1;
                }
+               updated = 1;
        }
 
        change_uid = am_root && preserve_uid && st->st_uid != file->uid;
-       change_gid = !am_daemon && preserve_gid && file->gid != -1 \
-                               && st->st_gid != file->gid;
-       if (change_gid && !am_root) {
-               /* enforce bsd-style group semantics: non-root can only
-                   change to groups that the user is a member of */
-               change_gid = is_in_group(file->gid);
-       }
+       change_gid = preserve_gid && file->gid != GID_NONE
+               && st->st_gid != file->gid;
+#if !defined HAVE_LCHOWN && !defined CHOWN_MODIFIES_SYMLINK
+       if (S_ISLNK(st->st_mode))
+               ;
+       else
+#endif
        if (change_uid || change_gid) {
+               if (verbose > 2) {
+                       if (change_uid) {
+                               rprintf(FINFO,
+                                       "set uid of %s from %ld to %ld\n",
+                                       safe_fname(fname),
+                                       (long)st->st_uid, (long)file->uid);
+                       }
+                       if (change_gid) {
+                               rprintf(FINFO,
+                                       "set gid of %s from %ld to %ld\n",
+                                       safe_fname(fname),
+                                       (long)st->st_gid, (long)file->gid);
+                       }
+               }
                if (do_lchown(fname,
-                             change_uid?file->uid:st->st_uid,
-                             change_gid?file->gid:st->st_gid) != 0) {
+                   change_uid ? file->uid : st->st_uid,
+                   change_gid ? file->gid : st->st_gid) != 0) {
                        /* shouldn't have attempted to change uid or gid
-                            unless have the privilege */
-                       rprintf(FERROR,"chown %s : %s\n", fname,strerror(errno));
+                        * unless have the privilege */
+                       rsyserr(FERROR, errno, "%s %s failed",
+                           change_uid ? "chown" : "chgrp",
+                           full_fname(fname));
                        return 0;
                }
+               /* a lchown had been done - we have to re-stat if the
+                * destination had the setuid or setgid bits set due
+                * to the side effect of the chown call */
+               if (st->st_mode & (S_ISUID | S_ISGID)) {
+                       link_stat(fname, st,
+                                 keep_dirlinks && S_ISDIR(st->st_mode));
+               }
                updated = 1;
        }
 
 #ifdef HAVE_CHMOD
-       if (preserve_perms && !S_ISLNK(st->st_mode) &&
-           (st->st_mode != file->mode || 
-            (updated && (file->mode & ~ACCESSPERMS)))) {
-               updated = 1;
-               if (do_chmod(fname,file->mode) != 0) {
-                       rprintf(FERROR,"failed to set permissions on %s : %s\n",
-                               fname,strerror(errno));
-                       return 0;
+       if (!S_ISLNK(st->st_mode)) {
+               if ((st->st_mode & CHMOD_BITS) != (file->mode & CHMOD_BITS)) {
+                       updated = 1;
+                       if (do_chmod(fname,(file->mode & CHMOD_BITS)) != 0) {
+                               rsyserr(FERROR, errno, "failed to set permissions on %s",
+                                       full_fname(fname));
+                               return 0;
+                       }
                }
        }
 #endif
-    
-       if (verbose > 1 && report) {
+
+       if (verbose > 1 && flags & PERMS_REPORT) {
+               enum logcode code = daemon_log_format_has_i || dry_run
+                                 ? FCLIENT : FINFO;
                if (updated)
-                       rprintf(FINFO,"%s\n",fname);
+                       rprintf(code, "%s\n", safe_fname(fname));
                else
-                       rprintf(FINFO,"%s is uptodate\n",fname);
+                       rprintf(code, "%s is uptodate\n", safe_fname(fname));
        }
        return updated;
 }
@@ -224,58 +151,62 @@ int set_perms(char *fname,struct file_struct *file,STRUCT_STAT *st,
 
 void sig_int(void)
 {
+       /* KLUGE: if the user hits Ctrl-C while ssh is prompting
+        * for a password, then our cleanup's sending of a SIGUSR1
+        * signal to all our children may kill ssh before it has a
+        * chance to restore the tty settings (i.e. turn echo back
+        * on).  By sleeping for a short time, ssh gets a bigger
+        * chance to do the right thing.  If child processes are
+        * not ssh waiting for a password, then this tiny delay
+        * shouldn't hurt anything. */
+       msleep(400);
        exit_cleanup(RERR_SIGNAL);
 }
 
-int make_backup(char *fname)
-{
-       char fnamebak[MAXPATHLEN];
-       if (strlen(fname) + strlen(backup_suffix) > (MAXPATHLEN-1)) {
-               rprintf(FERROR,"backup filename too long\n");
-               return 0;
-       }
-
-       slprintf(fnamebak,sizeof(fnamebak),"%s%s",fname,backup_suffix);
-       if (do_rename(fname,fnamebak) != 0) {
-               if (errno != ENOENT) {
-                       rprintf(FERROR,"rename %s %s : %s\n",fname,fnamebak,strerror(errno));
-                       return 0;
-               }
-       } else if (verbose > 1) {
-               rprintf(FINFO,"backed up %s to %s\n",fname,fnamebak);
-       }
-       return 1;
-}
-
 
 /* finish off a file transfer, renaming the file and setting the permissions
    and ownership */
-void finish_transfer(char *fname, char *fnametmp, struct file_struct *file)
+void finish_transfer(char *fname, char *fnametmp, struct file_struct *file,
+                    int ok_to_set_time, int overwriting_basis)
 {
-       if (make_backups && !make_backup(fname))
+       int ret;
+
+       if (inplace) {
+               if (verbose > 2)
+                       rprintf(FINFO, "finishing %s\n", safe_fname(fname));
+               goto do_set_perms;
+       }
+
+       if (make_backups && overwriting_basis && !make_backup(fname))
                return;
 
+       /* Change permissions before putting the file into place. */
+       set_perms(fnametmp, file, NULL, ok_to_set_time ? 0 : PERMS_SKIP_MTIME);
+
        /* move tmp file over real file */
-       if (do_rename(fnametmp,fname) != 0) {
-               if (errno == EXDEV) {
-                       /* rename failed on cross-filesystem link.  
-                          Copy the file instead. */
-                       if (copy_file(fnametmp,fname, file->mode & ACCESSPERMS)) {
-                               rprintf(FERROR,"copy %s -> %s : %s\n",
-                                       fnametmp,fname,strerror(errno));
-                       } else {
-                               set_perms(fname,file,NULL,0);
-                       }
-                       do_unlink(fnametmp);
-               } else {
-                       rprintf(FERROR,"rename %s -> %s : %s\n",
-                               fnametmp,fname,strerror(errno));
-                       do_unlink(fnametmp);
-               }
-       } else {
-               set_perms(fname,file,NULL,0);
+       if (verbose > 2) {
+               rprintf(FINFO, "renaming %s to %s\n",
+                       safe_fname(fnametmp), safe_fname(fname));
+       }
+       ret = robust_rename(fnametmp, fname, file->mode & INITACCESSPERMS);
+       if (ret < 0) {
+               rsyserr(FERROR, errno, "%s %s -> \"%s\"",
+                   ret == -2 ? "copy" : "rename",
+                   full_fname(fnametmp), safe_fname(fname));
+               do_unlink(fnametmp);
+               return;
+       }
+       if (ret == 0) {
+               /* The file was moved into place (not copied), so it's done. */
+               return;
        }
+    do_set_perms:
+       set_perms(fname, file, NULL, ok_to_set_time ? 0 : PERMS_SKIP_MTIME);
 }
 
-
-
+const char *who_am_i(void)
+{
+       if (am_starting_up)
+               return am_server ? "server" : "client";
+       return am_sender ? "sender" : am_generator ? "generator" : "receiver";
+}